A method and device for frequency jitter optimization based on switching power supply

Abstract

The present application discloses a method and device for frequency jitter optimization based on a switching power supply, the method comprising: obtaining a first switching parameter when the switching power supply is operating in a rated operating state, determining a first duty cycle according to the first switching parameter, and determining a first system gain when the switching power supply is operating in a rated operating state according to the first duty cycle. Obtain a second switching parameter of the switching power supply after the frequency jitter is introduced, determine a duty cycle adjustment deviation value according to the second switching parameter and the first switching parameter; determine a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, and control the switching power supply to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain. The present application can effectively reduce the loss of the switching power supply and improve the stability of the switching power supply.

Description

Technical Field

[0001] The present application relates to the field of power electronic control, and in particular to a frequency jitter optimization and device based on a switching power supply. Background Art

[0002] At present, in the application of switching power supply, in order to solve the electromagnetic compatibility (EMC) of switching power supply, the frequency jitter method is usually introduced when the pulse width modulation (PWM) controls the switch tube to turn on or off, that is, the period of the duty cycle of the switch tube is periodically changed. Electromagnetic compatibility refers to the ability of a device or system to operate in accordance with the requirements in its electromagnetic environment and not to cause intolerable electromagnetic interference to any device in its environment. Because the period of the duty cycle of the switch tube is periodically changed, it is equivalent to introducing some disturbances to the system, thereby increasing the output voltage or output current ripple. Summary of the invention

[0003] The embodiments of the present application provide a method and device for frequency jitter optimization based on a switching power supply, which can effectively reduce the ripple caused by frequency jitter and improve the stability of the switching power supply.

[0004] A first aspect of an embodiment of the present application provides a frequency jitter optimization method based on a switching power supply, the method comprising:

[0005] Acquire a first switching parameter when the switching power supply operates in a rated working state, determine a first duty cycle according to the first switching parameter, and determine a first system gain when the switching power supply operates in the rated working state according to the first duty cycle;

[0006] Acquire a second switch parameter of the switching power supply after the frequency jittering is introduced, and determine a duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter;

[0007] Determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, wherein the second duty cycle is determined by the second switch parameter;

[0008] The switching power supply is controlled to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0009] In combination with the first aspect, in a possible implementation manner, the first switching parameter includes a first switching period, a first on-time, and a dead time of the switching power supply; and determining the first duty cycle according to the first switching parameter includes:

[0010] Determine a first effective on-time according to the first on-time and the dead time of the switching power supply;

[0011] And the first duty cycle is determined according to the first effective on-time and the first switching period.

[0012] In combination with the first aspect, in a possible implementation manner, the first switch parameter further includes a first input / output parameter; and the second switch parameter of the switching power supply after the frequency jitter is introduced is obtained, including:

[0013] Determine a frequency jitter range that enables the switching power supply to be electromagnetically compatible, and adjust the switching frequency of the switching power supply within the frequency jitter range;

[0014] When the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter, the switching parameter of the switching power supply is obtained as the second switching parameter of the switching power supply after the frequency jittering is introduced.

[0015] In combination with the first aspect, in a possible implementation manner, the second switching parameter includes a second switching period, a second on-time, and a dead time of the switching power supply; and the method further includes:

[0016] Determine a second effective on-time according to the second on-time and the dead time of the switching power supply;

[0017] A second duty cycle is determined according to the second effective on-time and the second switching period, and the second duty cycle is used to determine the duty cycle adjustment deviation value.

[0018] In combination with the first aspect, in a possible implementation manner, the first switching parameter further includes a first switching frequency, and the second switching parameter further includes a second switching frequency; and the step of determining the duty cycle adjustment deviation value according to the second switching parameter and the first switching parameter includes:

[0019] The duty cycle adjustment deviation value is determined according to the first duty cycle, the first switching frequency, the second duty cycle, the second switching frequency, and a maximum frequency jitter threshold or a minimum frequency jitter threshold for making the switching power supply electromagnetically compatible.

[0020] In combination with the first aspect, in a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0021]

[0022] Among them, ΔD is the above-mentioned duty cycle adjustment deviation value, f is the above-mentioned first switching frequency, f1 is the maximum frequency jitter threshold or the minimum frequency jitter threshold that makes the above-mentioned switching power supply electromagnetic compatible, f2 is the above-mentioned second switching frequency, D1 is the above-mentioned first duty cycle, and D2 is the above-mentioned second duty cycle.

[0023] In combination with the first aspect, in a possible implementation manner, determining the duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter includes:

[0024] The duty cycle adjustment deviation value is determined according to the first effective on-time, the first switching period in the first switching parameter, the second effective on-time, and the second switching period in the second switching parameter.

[0025] In combination with the first aspect, in a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0026]

[0027] Where ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time mentioned above.

[0028] In a second aspect, the present application provides a frequency jitter optimization device based on a switching power supply, the device comprising:

[0029] A first acquisition module: used to acquire a first switch parameter when the switching power supply operates in a rated working state;

[0030] A first determining module: used to determine a first duty cycle according to the first switch parameter obtained by the first obtaining module, and determine a first system gain when the switching power supply operates in the rated working state according to the first duty cycle;

[0031] A second acquisition module: used to acquire a second switch parameter of the switching power supply after the frequency jitter is introduced;

[0032] A second determining module: configured to determine a duty cycle adjustment deviation value according to the second switch parameter acquired by the second acquiring module and the first switch parameter acquired by the first acquiring module;

[0033] A third determination module: used for determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, wherein the second duty cycle is determined by the second switch parameter;

[0034] A first control module is used to control the switching power supply to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0035] In combination with the second aspect, in a possible implementation manner, the first switching parameter includes a first switching period, a first on-time, and a dead time of the switching power supply, and the first determining module is used to:

[0036] Determine a first effective on-time according to the first on-time and the dead time of the switching power supply;

[0037] And the first duty cycle is determined according to the first effective on-time and the first switching period.

[0038] In combination with the second aspect, in a possible implementation manner, the first switch parameter further includes a first input / output parameter; and the second acquisition module is used to:

[0039] Determine a frequency jitter range that enables the switching power supply to be electromagnetically compatible, and adjust the switching frequency of the switching power supply within the frequency jitter range;

[0040] When the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter, the switching parameter of the switching power supply is obtained as the second switching parameter of the switching power supply after the frequency jittering is introduced.

[0041] In combination with the second aspect, in a possible implementation manner, the second switching parameter includes a second switching period, a second on-time, and a dead time of the switching power supply, and the device further includes:

[0042] The fourth determination module is used to determine the second effective on-time according to the second on-time and the dead time of the switching power supply; determine the second duty cycle according to the second effective on-time and the second switching period, and the second duty cycle is used to determine the duty cycle adjustment deviation value.

[0043] In combination with the second aspect, in a possible implementation manner, the first switching parameter further includes a first switching frequency, the second switching parameter further includes a second switching frequency, and the third determining module is used to:

[0044] The duty cycle adjustment deviation value is determined according to the first duty cycle, the first switching frequency, the second duty cycle, the second switching frequency, and a maximum frequency jitter threshold or a minimum frequency jitter threshold for making the switching power supply electromagnetically compatible.

[0045] In combination with the second aspect, in a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0046]

[0047] Among them, ΔD is the above-mentioned duty cycle adjustment deviation value, f is the above-mentioned first switching frequency, f1 is the maximum frequency jitter threshold or the minimum frequency jitter threshold that makes the above-mentioned switching power supply electromagnetic compatible, f2 is the above-mentioned second switching frequency, D1 is the above-mentioned first duty cycle, and D2 is the above-mentioned second duty cycle.

[0048] In combination with the second aspect, in a possible implementation manner, the third determining module is further configured to:

[0049] The duty cycle adjustment deviation value is determined according to the first effective on-time, the first switching period in the first switching parameter, the second effective on-time, and the second switching period in the second switching parameter.

[0050] In combination with the second aspect, in a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0051]

[0052] Where ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time mentioned above.

[0053] In a third aspect, the present application provides a computer device, including: a processor, a memory, and a network interface;

[0054] The processor is connected to a memory and a network interface, wherein the network interface is used to provide a data communication function, the memory is used to store program code, and the processor is used to call the program code to execute the method executed by the above-mentioned first aspect and any possible implementation method of the first aspect in the present application.

[0055] In a fourth aspect, the present application provides a computer-readable storage medium, which stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, they execute the method performed by the above-mentioned first aspect of the present application and any possible implementation method of the first aspect.

[0056] In the present application, by obtaining the first switch parameter of the switching power supply working in the rated working state and the second switch parameter after the frequency jitter is introduced, the first duty cycle is determined according to the first switch parameter, and the first system gain of the switching power supply working in the rated working state is determined according to the first duty cycle. And the duty cycle adjustment deviation value is determined according to the second switch parameter and the first switch parameter, the target duty cycle is determined according to the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle, and the switching power supply is controlled to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain. Since the introduction of frequency jittering is equivalent to bringing a certain disturbance to the system, it manifests as noise or output ripple at the output end of the switching power supply, and its size is mainly determined by the system gain. By adding a method to compensate for the duty cycle during the frequency jittering process, that is, determining the duty cycle adjustment deviation value, and then controlling the switching power supply to work through the target duty cycle so that the system gain before and after the introduction of frequency jittering is the same, the effect of the change in effective conduction time caused by the change in the period after the introduction of frequency jittering and the increase in output ripple caused by the change in system gain is eliminated, the loss of the switching power supply is reduced, and the stability of the switching power supply is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 This is a flow chart of a method for frequency jitter optimization based on a switching power supply provided by the present application;

[0059] Figure 2 This is another flow chart of a frequency jitter optimization method based on a switching power supply provided by the present application;

[0060] Figure 3 This is a structural schematic diagram of a frequency jitter optimization device based on a switching power supply provided by the present application;

[0061] Figure 4 This is another structural schematic diagram of a frequency jitter optimization device based on a switching power supply provided by the present application;

[0062] Figure 5 It is a structural schematic diagram of the computer device provided by this application. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] The switching power supply-based frequency jitter optimization method provided in the present application is applicable to the field of switching power supplies. The switching power supply (SMPS), also known as a switching power supply or a switching converter, is a high-frequency power conversion device. The switching power supply is also a power supply that uses modern power electronics technology to control the time ratio of the semiconductor power switch tube to be turned on and off to maintain a stable output voltage. In many cases, the switching power supply must have a strong anti-electromagnetic interference capability, such as the ability to adapt to surges and grid voltage fluctuations, and the anti-interference capability to static electricity, magnetic fields, electromagnetic waves, etc., to ensure that it can work normally and the stability of the power supply to the equipment. On the one hand, because the semiconductor power switch device or the main power transformer inside the switching power supply works in a high-frequency switching mode, its voltage and current waveforms are mostly square waves. In the process of high-voltage and high-current square wave switching, severe harmonic voltages and currents will be generated. These harmonic voltages and currents, on the one hand, are transmitted through the power input line or the output line of the switching power supply, and interfere with other devices and power grids that are powered on the same power grid as the power supply, so that the equipment cannot work normally; on the other hand, severe harmonic voltages and currents generate electromagnetic interference inside the switching power supply, thereby causing instability in the internal operation of the switching power supply and reducing the performance of the power supply. Some electromagnetic fields also radiate to the surrounding space through the gaps in the switching power supply housing, and propagate through space together with the radiated electromagnetic fields generated by the power lines and DC output lines, causing interference to other high-frequency devices and devices that are sensitive to electromagnetic fields, causing other devices to work abnormally. Therefore, the switching power supply should limit the conducted interference generated by the load lines and power lines, as well as the electromagnetic field interference propagated by radiation, so that devices in the same electromagnetic environment can work normally without interfering with each other. A large number of electromagnetic compatibility standards at home and abroad have also established constraints for the devices in the system to achieve electromagnetic compatibility with each other.

[0065] Compared with the traditional measures to suppress electromagnetic interference, such as reducing leakage inductance and distributed capacitance, or adding some filtering devices, the frequency jitter (Frequency Jitter, FJ) technology refers to the fact that the operating frequency of the switching power supply is not fixed, but changes periodically. Frequency jitter technology does not solve the electromagnetic compatibility problem from the perspective of reducing distributed parameters, which is an extremely difficult process, nor does it use interference bypass methods such as filtering. Instead, it starts from the principle of electromagnetic compatibility test instrument testing and achieves "spectrum shifting" from the perspective of dispersing concentrated spectrum energy to solve electromagnetic compatibility problems. The distributed parameters here specifically refer to the distributed inductance and distributed capacitance around the circuit components. However, the use of frequency jitter technology periodically changes the cycle of the control duty cycle, loses the stability of the frequency, which is equivalent to introducing some disturbances to the system, causing the ripple of the output voltage and output current to increase. The ripple here specifically refers to the AC component superimposed on the DC stable quantity in the DC voltage or current. When viewed with an oscilloscope, it can be seen that the voltage fluctuates slightly up and down like water ripples, so it is called ripple. The increase in the ripple of the output voltage and output current will bring noise, thereby affecting the operation of the system. Based on the above problems, an embodiment of the present application proposes a frequency jitter optimization method based on a switching power supply, which eliminates the influence of output ripple on the performance of the switching power supply by adding a method for compensating the duty cycle during the frequency jittering process.

[0066] In an optional embodiment of the present application, the switching power supply is mainly composed of a main circuit, a control module and an auxiliary power supply. The auxiliary power supply is mainly used to supply power to the main circuit and the control module. The control module includes a pulse modulation controller, and the main circuit can be a buck circuit or a boost circuit, which can be determined according to the actual application scenario and is not limited here.

[0067] A pulse width modulation (PWM) controller modulates the base or gate bias of the semiconductor power switch device according to the change of the corresponding load to achieve a change in the conduction time, thereby achieving a change in the duty cycle. The pulse width modulator can control the on and off of the semiconductor power switch device so that the output end obtains a series of pulses with equal amplitudes, that is, multiple pulses are generated in half a cycle of the output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output waveform is smooth and has few low-order harmonics. By modulating the width of each pulse according to certain rules, the size of the circuit output voltage can be changed, and the output frequency can also be changed. In an optional embodiment of the present application, the pulse width modulation controller controls the operation of the switching power supply according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0068] Among them, the semiconductor power switch device that controls the on-time of the semiconductor power switch device to change the duty cycle can be an insulated gate bipolar transistor (IGBT), and power devices such as insulated gate bipolar transistors have a certain junction capacitance, which will cause a delay in the on-off of the device. In order to make the above-mentioned insulated gate double-click transistor work reliably and avoid the upper and lower bridge arms of the main circuit being directly connected due to the turn-off delay effect, it is necessary to set the dead time when the output waveform is controlled by pulse width modulation, that is, the time when the upper and lower bridge arms of the main circuit are turned off at the same time. The dead time is also called the pulse width modulation response time, which can effectively avoid the delay effect caused by one bridge arm not being completely turned off, while the other bridge arm is in the on state, to avoid direct damage to the circuit. In an optional embodiment of the present application, the first effective on-time is determined by obtaining the first on-time when the switching power supply is working in the rated working state and the dead time of the above-mentioned switching power supply; the second effective on-time is determined by obtaining the second on-time of the above-mentioned switching power supply after the introduction of frequency jitter and the dead time of the above-mentioned switching power supply. The first effective on-time and the second effective on-time are used to determine a first duty cycle and a second duty cycle respectively.

[0069] The following will be combined Figure 1-Figure 4 A frequency jittering optimization method based on a switching power supply, a frequency jittering optimization device based on a switching power supply, and a computer device of the present application are described.

[0070] See also Figure 1 , Figure 1 1 is a flow chart of a method for frequency jitter optimization based on a switching power supply provided by the present application. The method can be executed by a computer device. Figure 1 As shown, a frequency jitter optimization method based on a switching power supply provided in an embodiment of the present application may include the following steps:

[0071] S101, obtaining a first switching parameter when the switching power supply operates in a rated operating state.

[0072] In some feasible implementations, the rated working state refers to the working state when the switching power supply continues to work normally. When the switching power supply works in the rated working state, the first switching parameter is obtained, and the first switching parameter includes but is not limited to the first switching cycle, the first conduction time, the dead time of the switching power supply, the first input / output parameter, and the first switching frequency. Among them, the first input / output parameter may include the first input current, the first input voltage, the first output current, and the first output voltage. The first conduction time and the dead time of the switching power supply are used to determine the first effective conduction time; the first switching cycle is used to determine the first duty cycle together with the first effective conduction time; the first switching frequency is used to determine the duty cycle adjustment deviation value; the first input / output parameter is used to adjust the switching frequency of the switching power supply within the frequency jitter range after the frequency jitter is subsequently introduced, and the second switching parameter is obtained when the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter.

[0073] S102, determining a first duty cycle according to a first switching parameter, and determining a first system gain when the switching power supply operates in a rated working state according to the first duty cycle.

[0074] In some feasible implementations, when the switching power supply operates in a rated operating state, a first effective on-time is determined according to the first on-time and the dead time of the switching power supply, that is, the first effective on-time is determined by the difference between the first on-time and the dead time of the switching power supply. A first duty cycle is determined according to the first effective on-time and the first switching period, where the first duty cycle is the actual effective duty cycle after the dead time is introduced, and the first duty cycle is used to determine a first system gain when the switching power supply operates at a rated operating point.

[0075] S103, obtaining a second switching parameter of the switching power supply after the frequency jittering is introduced.

[0076] In some feasible implementations, based on the principle that each device in the system can achieve electromagnetic compatibility with each other, a suitable frequency jitter range (f min , f max ), and set the switching frequency of the switching power supply to the maximum threshold value f of the frequency jitter range max Or the minimum threshold f of the frequency jitter range min Within the above frequency jitter range from the above maximum threshold f max Or the minimum threshold f minStart adjusting the switching frequency of the switching power supply by detecting the input / output parameters of the switching power supply, wherein the input / output parameters include input current, input voltage, output current, and output voltage. When it is detected that the input / output parameters are the same as the first input / output parameters when the switching power supply is operating in the rated working state, obtain the switching parameters of the switching power supply as the second switching parameters of the switching power supply after the frequency jitter is introduced.

[0077] S104, determining a duty cycle adjustment deviation value according to the second switching parameter and the first switching parameter, and determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle.

[0078] In some feasible implementations, the duty cycle adjustment deviation value determined according to the second switching parameter and the first switching parameter can be determined according to the second switching frequency and the second duty cycle in the second switching parameter obtained after the frequency jitter is introduced, and the first switching frequency and the first duty cycle in the first switching parameter obtained in the rated working state, and the maximum frequency jitter threshold f that makes the switching power supply electromagnetically compatible. max Or the minimum frequency jitter threshold f min Determine the above-mentioned duty cycle adjustment deviation value, where the duty cycle adjustment deviation value is the specific value for compensating the duty cycle. The above-mentioned determination of the target duty cycle based on the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle may be to determine the above-mentioned target duty cycle based on the sum of the above-mentioned duty cycle adjustment deviation value and the above-mentioned first duty cycle. Optionally, the above-mentioned determination of the target duty cycle based on the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle may also be to determine the above-mentioned target duty cycle based on the sum of the above-mentioned duty cycle adjustment deviation value and the above-mentioned second duty cycle.

[0079] S105 , controlling the switching power supply to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0080] In some feasible implementations, the pulse width modulation controller modulates the base or gate bias of the switch tube of the switching power supply according to the change of the corresponding load to achieve the change of the conduction time, thereby adjusting the duty cycle to the target duty cycle, and controlling the switching power supply to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain. Since when the system gain is the same, if the input parameters of the switching power supply are constant, the output parameters of the switching power supply are also fixed in theory, therefore, by taking the first input / output parameters in the rated working state as a reference, the frequency jitter range is changed from the maximum threshold value f max Or the minimum threshold f minStart adjusting the switching frequency of the switching power supply until it is detected that the input / output parameter of the switching power supply is the same as the first input / output parameter, obtain the second switching parameter of the switching power supply, and determine the duty cycle adjustment deviation value through the second switching parameter and the first switching parameter. The duty cycle adjustment deviation value here is the difference between the duty cycle when the switching frequency is adjusted to the maximum deviation threshold and the first duty cycle when the switching power supply is in the rated working state, that is, the specific value for compensating the duty cycle. In an optional embodiment of the present application, by compensating the duty cycle, the system gain is kept consistent, eliminating the influence of the output ripple on the performance of the switching power supply.

[0081] In the present application, by obtaining the first switch parameter of the switching power supply working in the rated working state and the second switch parameter after the frequency jitter is introduced, the first duty cycle is determined according to the first switch parameter, and the first system gain of the switching power supply when working in the rated working state is determined according to the first duty cycle. And the duty cycle adjustment deviation value is determined according to the second switch parameter and the first switch parameter, the target duty cycle is determined according to the duty cycle adjustment deviation value and the first duty cycle, and the switching power supply is controlled to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain. Since the introduction of frequency jitter is equivalent to bringing a certain disturbance to the system, it is manifested as noise, that is, output ripple, at the output end of the switching power supply, and its size is mainly determined by the system gain. By adding a method for compensating the duty cycle during the frequency jitter process, that is, determining the duty cycle adjustment deviation value, and then controlling the switching power supply to work through the target duty cycle so that the system gain before and after the introduction of frequency jitter is the same, the change in the effective conduction time caused by the change in the cycle after the introduction of frequency jitter is eliminated, and the influence of the increase in output ripple caused by the change in system gain is eliminated, and the stability of the switching power supply is improved.

[0082] Please continue to see Figure 2 , Figure 2 is another flow chart of a frequency jitter optimization method based on a switching power supply provided by the present application, such as Figure 2 The method steps shown can also be used to perform the following embodiments:

[0083] S201, obtaining a first switching parameter of the switching power supply when it operates in a rated operating state, and determining a first duty cycle according to the first switching parameter.

[0084] In some feasible implementations, the first switch parameter is obtained when the switching power supply operates in the rated working state, and the first switch parameter includes but is not limited to the first switch period, the first conduction time, and the dead time of the switching power supply. The first conduction time and the dead time of the switching power supply are used to determine the first effective conduction time; and the first duty cycle is determined according to the first switch period and the first effective conduction time in the first switch parameter. The first duty cycle is used to determine the first system gain and the target duty cycle when the switching power supply operates in the rated working state.

[0085] S202: Determine a first system gain when the switching power supply operates in a rated operating state according to the first duty cycle.

[0086] In some feasible implementations, the first system gain when the switching power supply operates at a rated operating point is determined according to the first duty cycle. Here, the first system gain is:

[0087] Gain=k*D

[0088] Among them, Gain is the first system gain, k is a polynomial, k is mainly determined by the transfer function of the system, and D is the above-mentioned first duty cycle, which is determined by the ratio of the above-mentioned first effective conduction time to the above-mentioned first switching period. It can be seen from the formula of the above-mentioned first system gain that when the duty cycle is the same, the system gain will not change when the switching period changes. However, because the switching period has changed due to the introduction of frequency jittering, the actual effective duty cycle has also changed accordingly, the system stability has decreased, and the output ripple has increased. Therefore, it is necessary to compensate for the duty cycle to keep the system gain consistent after the introduction of frequency jittering, thereby eliminating the impact of output ripple on system performance.

[0089] S203, obtaining a second switching parameter of the switching power supply after the frequency jittering is introduced, and determining a second duty cycle according to the second switching parameter.

[0090] In some feasible implementations, the second switching parameters after the switching power supply frequency is jittered are obtained. The second switching parameters include a second switching period, a second on-time, a second switching frequency, and a dead time of the switching power supply. The second switching frequency is used to determine the duty cycle adjustment deviation value; the second on-time and the dead time of the switching power supply are used to determine the second effective on-time; the second duty cycle is determined according to the second switching period and the second effective on-time in the second switching parameters, and the second duty cycle is used to determine the target duty cycle.

[0091] S204, determining a duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter.

[0092] In some feasible implementations, according to the second switching frequency and the second duty cycle in the second switching parameter obtained after the frequency jitter is introduced, and the first switching frequency and the first duty cycle in the first switching parameter obtained in the rated working state, and the maximum frequency jitter threshold f that makes the switching power supply electromagnetically compatible, max Or the minimum frequency jitter threshold f min The duty cycle adjustment deviation value is determined, where the duty cycle adjustment deviation value is the specific value for compensating the duty cycle.

[0093] In a feasible implementation manner, the duty cycle adjustment deviation value satisfies:

[0094]

[0095] Wherein, ΔD is the duty cycle adjustment deviation value, f is the first switching frequency, and f1 is the maximum frequency jitter threshold f that makes the switching power supply electromagnetically compatible. max Or the minimum frequency jitter threshold f min , f2 is the second switching frequency, D1 is the first duty cycle, and D2 is the second duty cycle.

[0096] In some feasible implementations, the duty cycle adjustment deviation value determined according to the second switch parameter and the first switch parameter can also be determined according to the first switch period, the first effective conduction time in the first switch parameter obtained in the rated working state, and the second switch period in the second switch parameter obtained after the switching power supply introduces frequency jittering. The duty cycle adjustment deviation value here is the specific value of the duty cycle compensation. In a feasible implementation, the duty cycle adjustment deviation value also satisfies:

[0097]

[0098] Where ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time mentioned above.

[0099] S205: Determine a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle.

[0100] In a feasible implementation manner, the target duty cycle is determined according to the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle, and the target duty cycle is determined according to the sum of the duty cycle adjustment deviation value and the first duty cycle. In this case, the target duty cycle satisfies:

[0101]

[0102] Where D is the target duty cycle, f is the first switching frequency, and f1 is the maximum frequency jitter threshold f that makes the switching power supply electromagnetic compatible. max Or the minimum frequency jitter threshold f min , f2 is the second switching frequency, D1 is the first duty cycle, and D2 is the second duty cycle.

[0103] In a feasible implementation manner, the target duty cycle may be determined according to the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle, and the target duty cycle may be determined according to the sum of the duty cycle adjustment deviation value and the second duty cycle. In this case, the target duty cycle also satisfies:

[0104]

[0105] Where D is the target duty cycle, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the above-mentioned second effective on-time, and D2 is the above-mentioned second duty cycle.

[0106] S206, controlling the switching power supply to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0107] In some feasible embodiments, the pulse width modulation controller modulates the base or gate bias of the switching tube of the switching power supply according to the change of the corresponding load to achieve the change of the conduction time, thereby adjusting the duty cycle to the target duty cycle, and controlling the switching power supply to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0108] In the present application, by obtaining the first switch parameter of the switching power supply working in the rated working state and the second switch parameter after the frequency jitter is introduced, the first duty cycle is determined according to the first switch parameter, and the first system gain of the switching power supply when working in the rated working state is determined according to the first duty cycle. And the duty cycle adjustment deviation value is determined according to the second switch parameter and the first switch parameter, the target duty cycle is determined according to the duty cycle adjustment deviation value and the second duty cycle, and the switching power supply is controlled to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain. Since the introduction of frequency jitter is equivalent to bringing a certain disturbance to the system, it is manifested as noise, that is, output ripple, at the output end of the switching power supply, and its size is mainly determined by the system gain, and by adding a method for compensating the duty cycle in the frequency jitter process, that is, determining the duty cycle adjustment deviation value, and then controlling the switching power supply to work by the target duty cycle so that the system gain before and after the introduction of frequency jitter is the same, the change in the effective conduction time caused by the change in the period after the introduction of frequency jitter is eliminated, and the output ripple increases due to the change in the system gain, the loss of the switching power supply is reduced, and the stability of the switching power supply is improved.

[0109] For further information, see Figure 3 , Figure 3 : is a structural diagram of a switching power supply-based frequency jitter optimization device provided in the present application. The switching power supply-based frequency jitter optimization device may be a computer program (including program code) running in a computer device. For example, the switching power supply-based frequency jitter optimization device is an application software; the switching power supply-based frequency jitter optimization device may be used to execute the corresponding steps in the method provided in the present application. Figure 3 As shown, the above-mentioned frequency jitter optimization device based on the switching power supply includes: a first acquisition module 10, a first determination module 20, a second acquisition module 30, a second determination module 40, and a third determination module 50.

[0110] A first acquisition module 10: used to acquire a first switch parameter when the switching power supply operates in a rated working state;

[0111] A first determining module 20 is configured to determine a first duty cycle according to the first switch parameter obtained by the first obtaining module 10, and determine a first system gain when the switching power supply operates in the rated working state according to the first duty cycle;

[0112] The second acquisition module 30 is used to acquire the second switch parameter of the switching power supply after the frequency jitter is introduced;

[0113] A second determining module 40 is used to determine a duty cycle adjustment deviation value according to the second switch parameter obtained by the second obtaining module 30 and the first switch parameter obtained by the first obtaining module 10;

[0114] A third determination module 50 is configured to determine a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle and / or the second duty cycle, wherein the second duty cycle is determined by the second switch parameter;

[0115] The first control module 60 is used for controlling the switching power supply to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0116] In a possible implementation manner, the first switching parameter includes a first switching period, a first on-time, and a dead time of the switching power supply, and the first determining module 20 is used to:

[0117] Determine a first effective on-time according to the first on-time and the dead time of the switching power supply;

[0118] And the first duty cycle is determined according to the first effective on-time and the first switching period.

[0119] In a possible implementation manner, the first switch parameter further includes a first input / output parameter; and the second acquisition module 30 is used to:

[0120] Determine a frequency jitter range that enables the switching power supply to be electromagnetically compatible, and adjust the switching frequency of the switching power supply within the frequency jitter range;

[0121] When the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter, the switching parameter of the switching power supply is obtained as the second switching parameter of the switching power supply after the frequency jittering is introduced.

[0122] In a possible implementation manner, the second switch parameter includes a second switch period, a second on-time, and a dead time of the switch power supply. Figure 4 The above device also includes:

[0123] The fourth determination module 70 is used to determine the second effective on-time according to the second on-time and the dead time of the switching power supply; determine the second duty cycle according to the second effective on-time and the second switching period, and the second duty cycle is used to determine the duty cycle adjustment deviation value.

[0124] In a possible implementation manner, the first switching parameter further includes a first switching frequency, the second switching parameter further includes a second switching frequency, and the third determining module 50 is configured to:

[0125] The duty cycle adjustment deviation value is determined according to the first duty cycle, the first switching frequency, the second duty cycle, the second switching frequency, and a maximum frequency jitter threshold or a minimum frequency jitter threshold for making the switching power supply electromagnetically compatible.

[0126] In a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0127]

[0128] Among them, ΔD is the above-mentioned duty cycle adjustment deviation value, f is the above-mentioned first switching frequency, f1 is the maximum frequency jitter threshold or the minimum frequency jitter threshold that makes the above-mentioned switching power supply electromagnetic compatible, f2 is the above-mentioned second switching frequency, D1 is the above-mentioned first duty cycle, and D2 is the above-mentioned second duty cycle.

[0129] In a possible implementation manner, the third determining module 50 is further configured to:

[0130] The duty cycle adjustment deviation value is determined according to the first effective on-time, the first switching period in the first switching parameter, the second effective on-time, and the second switching period in the second switching parameter.

[0131] In a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0132]

[0133] Where ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time mentioned above.

[0134] It is understandable that the above Figure 3 as well as Figure 4 The first acquisition module 10, the first determination module 20, the second acquisition module 30, the second determination module 40, the third determination module 50, the fourth determination module 70, and the connection method of the fourth determination module 70 are exemplary, which can be determined according to the actual application scenario, and the embodiment of the present application does not limit it here. Among them, the specific implementation methods of the first acquisition module 10, the first determination module 20, the second acquisition module 30, the second determination module 40, the third determination module 50, and the fourth determination module 70 can refer to the above Figure 1 The description of steps S101 to S105 in the corresponding embodiment will not be repeated here. In addition, the description of the beneficial effects of the same method will not be repeated here either.

[0135] For further information, see Figure 5 , Figure 5 Schematic diagram of a computer device provided by this application. Figure 5 As shown, the computer device 1000 may include: at least one processor 1001, such as a CPU, at least one network interface 1003, a memory 1004, and at least one communication bus 1002. The communication bus 1002 is used to realize the connection and communication between these components. The network interface 1003 may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface). The memory 1004 may be a high-speed random access memory (RAM) memory, or a non-volatile memory (non-volatile memory), such as at least one disk storage. The memory 1004 may optionally also be at least one storage device located away from the aforementioned processor 1001. As shown in FIG. Figure 5 As shown, the memory 1004 as a computer storage medium may include an operating system, a network communication module, and a device control application.

[0136] exist Figure 5 In the computer device 1000 shown, the processor 1001 can be used to call the device control application stored in the memory 1004 to implement:

[0137] Acquire a first switching parameter when the switching power supply operates in a rated working state, determine a first duty cycle according to the first switching parameter, and determine a first system gain when the switching power supply operates in the rated working state according to the first duty cycle;

[0138] Acquire a second switch parameter of the switching power supply after the frequency jittering is introduced, and determine a duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter;

[0139] Determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, wherein the second duty cycle is determined by the second duty cycle;

[0140] The switching power supply is controlled to operate according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

[0141] In a possible implementation manner, the first switching parameter includes a first switching period, a first on-time, and a dead time of the switching power supply; the processor 1001 may be configured to:

[0142] Determine a first effective on-time according to the first on-time and the dead time of the switching power supply;

[0143] And the first duty cycle is determined according to the first effective on-time and the first switching period.

[0144] In a possible implementation manner, the first switch parameter further includes a first input / output parameter; and the processor 1001 may also be configured to:

[0145] Determine a frequency jitter range that enables the switching power supply to be electromagnetically compatible, and adjust the switching frequency of the switching power supply within the frequency jitter range;

[0146] When the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter, the switching parameter of the switching power supply is obtained as the second switching parameter of the switching power supply after the frequency jittering is introduced.

[0147] In a possible implementation manner, the second switching parameter includes a second switching period, a second on-time, and a dead time of the switching power supply; the processor 1001 may also be configured to:

[0148] Determine a second effective on-time according to the second on-time and the dead time of the switching power supply;

[0149] A second duty cycle is determined according to the second effective on-time and the second switching period, and the second duty cycle is used to determine the duty cycle adjustment deviation value.

[0150] In a possible implementation manner, the first switching parameter further includes a first switching frequency, and the second switching parameter further includes a second switching frequency; the processor 1001 may further be configured to:

[0151] The duty cycle adjustment deviation value is determined according to the first duty cycle, the first switching frequency, the second duty cycle, the second switching frequency, and a maximum frequency jitter threshold or a minimum frequency jitter threshold for making the switching power supply electromagnetically compatible.

[0152] In a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0153]

[0154] Among them, ΔD is the above-mentioned duty cycle adjustment deviation value, f is the above-mentioned first switching frequency, f1 is the maximum frequency jitter threshold or the minimum frequency jitter threshold that makes the above-mentioned switching power supply electromagnetic compatible, f2 is the above-mentioned second switching frequency, D1 is the above-mentioned first duty cycle, and D2 is the above-mentioned second duty cycle.

[0155] In a possible implementation manner, the processor 1001 may also be configured to:

[0156] The duty cycle adjustment deviation value is determined according to the first effective on-time, the first switching period in the first switching parameter, the second effective on-time, and the second switching period in the second switching parameter.

[0157] In a possible implementation manner, the duty cycle adjustment deviation value satisfies:

[0158]

[0159] Where ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time mentioned above.

[0160] In addition, it should be pointed out here that: the present application also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program executed by the aforementioned switching power supply-based frequency jitter optimization device, and the computer program includes program instructions. When the processor executes the program instructions, it can execute the aforementioned Figure 1 and / or Figure 2 The description of the frequency jitter optimization method based on the switching power supply in the corresponding embodiment will not be repeated here. In addition, the description of the beneficial effects of the same method will not be repeated. For technical details not disclosed in the computer-readable storage medium embodiment involved in this application, please refer to the description of the method embodiment of this application. As an example, program instructions may be deployed to execute on one computing device or on multiple computing devices located at one location.

[0161] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program. The above-mentioned program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the above-mentioned computer-readable storage medium can be a jitter optimization device based on a switching power supply provided in any of the above-mentioned embodiments or an internal storage unit of the above-mentioned device, such as a hard disk or memory of an electronic device. The computer-readable storage medium can also be an external storage device of the electronic device, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the electronic device. The above-mentioned computer-readable storage medium can also include a disk, an optical disk, a read-only memory (ROM) or a random access memory, etc. Further, the computer-readable storage medium can also include both an internal storage unit of the electronic device and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the electronic device. The computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0162] The terms "first", "second", etc. in the claims, specification and drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. Displaying the phrase at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. The term "and / or" used in the specification and the appended claims of the present invention refers to any combination of one or more of the items listed in association and all possible combinations, and includes these combinations.

[0163] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0164] Each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0165] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A frequency jitter optimization method based on a switching power supply, characterized in that: The method comprises: Acquire a first switching parameter when the switching power supply operates in a rated working state, determine a first duty cycle according to the first switching parameter, and determine a first system gain of the switching power supply when the switching power supply operates in the rated working state according to the first duty cycle; Acquire a second switch parameter of the switch power supply after the frequency jitter is introduced, and determine a duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter; determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, wherein the second duty cycle is determined by the second switching parameter; The switching power supply is controlled to operate according to the target duty cycle so that a system gain of the switching power supply is the same as the first system gain.

2. The method according to claim 1, characterized in that: The first switch parameter includes a first switch period, a first on-time, and a dead time of the switch power supply; The determining a first duty cycle according to the first switching parameter comprises: Determine a first effective on-time according to the first on-time and the dead time of the switching power supply; A first duty cycle is determined according to the first effective on-time and the first switching period.

3. The method according to claim 2, characterized in that The first switch parameter also includes a first input / output parameter; the obtaining of the second switch parameter of the switching power supply after the frequency jitter is introduced includes: Determining a frequency jitter range that enables the switching power supply to be electromagnetically compatible, and adjusting the switching frequency of the switching power supply within the frequency jitter range; When the input / output parameter of the switching power supply is adjusted to be the same as the first input / output parameter, the switching parameter of the switching power supply is obtained as the second switching parameter of the switching power supply after the frequency jittering is introduced.

4. The method according to claim 3, characterized in that The second switch parameter includes a second switch period, a second on-time, and a dead time of the switch power supply; the method further includes: Determine a second effective on-time according to the second on-time and the dead time of the switching power supply; A second duty cycle is determined according to the second effective on-time and the second switching period, and the second duty cycle is used to determine the duty cycle adjustment deviation value.

5. The method according to claim 4, characterized in that The first switching parameter further includes a first switching frequency, and the second switching parameter further includes a second switching frequency; and determining the duty cycle adjustment deviation value according to the second switching parameter and the first switching parameter includes: The duty cycle adjustment deviation value is determined according to the first duty cycle, the first switching frequency, the second duty cycle, the second switching frequency, and a maximum frequency jitter threshold or a minimum frequency jitter threshold for making the switching power supply electromagnetically compatible.

6. The method according to claim 5, characterized in that The duty cycle adjustment deviation value satisfies: Among them, ΔD is the duty cycle adjustment deviation value, f is the first switching frequency, f1 is the maximum frequency jitter threshold or the minimum frequency jitter threshold that makes the switching power supply electromagnetic compatible, f2 is the second switching frequency, D1 is the first duty cycle, and D2 is the second duty cycle.

7. The method according to claim 2, characterized in that: The second switch parameters include a second switch period, a second on-time and a dead time of the switch power supply; The step of determining the duty cycle adjustment deviation value according to the second switch parameter and the first switch parameter includes: Determine a second effective on-time according to the second on-time and the dead time of the switching power supply; The duty cycle adjustment deviation value is determined according to the first effective on-time, a first switching period in the first switching parameter, the second effective on-time, and a second switching period in the second switching parameter.

8. The method according to claim 7, characterized in that The duty cycle adjustment deviation value satisfies: Wherein, ΔD is the duty cycle adjustment deviation value, T a1 is the first effective on-time, T1 is the first switching period, T2 is the second switching period, T a2 is the second effective on-time.

9. A frequency jitter optimization device based on a switching power supply, characterized in that: The device comprises: A first acquisition module: used to acquire a first switch parameter when the switching power supply operates in a rated working state; A first determining module: used to determine a first duty cycle according to the first switch parameter obtained by the first obtaining module, and determine a first system gain when the switching power supply operates in the rated working state according to the first duty cycle; A second acquisition module: used to acquire a second switch parameter of the switching power supply after the frequency jitter is introduced; A second determining module: configured to determine a duty cycle adjustment deviation value according to the second switch parameter acquired by the second acquiring module and the first switch parameter acquired by the first acquiring module; A third determination module: used for determining a target duty cycle according to the duty cycle adjustment deviation value and the first duty cycle or the second duty cycle, wherein the second duty cycle is determined by the second switch parameter; A first control module is used to control the switching power supply to work according to the target duty cycle so that the system gain of the switching power supply is the same as the first system gain.

10. A computer device, characterized in that: include: Processor, memory, and network interface; The processor is connected to a memory and a network interface, wherein the network interface is used to provide a data communication function, the memory is used to store program codes, and the processor is used to call the program codes to execute the method described in any one of claims 1-8.

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